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RL78 Family

Chapter 2

EEPROM Emulation

EEPROM Emulation Library Pack02

R01US0068EJ0100

Rev.1.00

Page 16 of 53

Mar. 28, 2014

2. 3. 6

EEL Block Overview

Figure 2-7 shows an example of an EEL block that contains multiple units of stored data:

•Data ID 0x01 with size = 0x04,

•Data ID 0x02 with size = 0x01

•Data ID 0x03 is defined but not written here,

•Data ID 0x04 with size = 0x02

The data have been written in the sequence ID 0x01 -> ID 0x04 -> ID 0x02. In this example, the data with ID

0x03 has not been written yet.

Figure 2-7

Example of an Active EEL Block

SoR

à ID = 0x04

SoR

à ID = 0x01

SoR

à ID = 0x02

A = 0x02

erased area

(all bytes 0xFF)

DATA(ID=0x01)[0]

DATA(ID=0x04)[1]

DATA(ID=0x02)[0]

reference

area

data area

separator (erased 2 bytes)

B = 0xFD

I = 0xFF

X = 0xFF

reserved

0x0000

0x0001

0x0002

0x0003

0x0004

0x0005

0x0006

0x0007

EoR

à ~ID = 0xFE

EoR

à ~ID = 0xFB

EoR

à ~ID = 0xFD

0x0008

0x0009

0x000A

0x000B

0x000C

0x000D

0x000E

0x000F

DATA(ID=0x01)[1]

DATA(ID=0x01)[2]

DATA(ID=0x01)[3]

0x03FF

DATA(ID=0x04)[0]

0x03FE

0x03FD

0x03FC

0x03FB

0x03FA

0x03F9

0x03F8

…

block header

relative byte

index within

block

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